polishedball
noticing nice landscape pebbles
Member since August 2014
Posts: 89
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Post by polishedball on Sept 12, 2014 20:46:53 GMT -5
Hi all, hope you can help with a saw repair. It is a star st-14. The drive weakened the screw speed is fine it is the clamp assembly. Any idea where I may fine this part? The other side of the clamp is top side of the screw and bolted to bottom of the vise. It looks like it is a combination of clamping force some of the copper in the picture wore thru and broke off, thinking this may have been a previous owner fix, but not sure. Anyway any thoughts. Thanks. You can kinda see how this bolts together in the lower pic, it rides on the cam you can see pictured.
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Post by catmandewe on Sept 12, 2014 21:54:29 GMT -5
Can you braze it and retap it?
Tony
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Post by Rockoonz on Sept 13, 2014 11:17:25 GMT -5
The threads look ok in the pic. It looks like the copper or bronze piece that rides against the cam has worn out. I would have the old one ground off and a new one silver soldered on. Does the saw look like this one? www.worthpoint.com/worthopedia/star-diamond-slab-saw-lapidary-14-154654203If so you may be able to just use a copper or brass spring clamp on the threaded rod at the front of the vice carriage for a feed clutch, some saws use a clamp straight from the factory.
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QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,640
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Post by QuailRiver on Sept 13, 2014 12:00:50 GMT -5
I think Barranca Diamond bought out Start Diamond so if you can not fix this part you may want to check with Barranca and see if they still have any old-stock parts for your saw. Larry C.
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polishedball
noticing nice landscape pebbles
Member since August 2014
Posts: 89
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Post by polishedball on Sept 13, 2014 17:51:43 GMT -5
You are correct, the threads are pretty good. It is a clamping thing mostly I assume from the worn broken copper. What I just did as a temp fix is similar to what was mentioned above. I just put a hose clamp on the cam increasing it's diameter allowing for tighter pinch. Trying the first rock now.
Will copper attach pretty easy to the brass if I try to fix it correct?
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 13, 2014 19:09:48 GMT -5
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,352
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Post by quartz on Sept 13, 2014 22:33:15 GMT -5
Certainly have a look at Shotgunner's clamp idea thread. If you choose to repair it, the copper and brass {or use brass as repair part} can be easily silver soldered; very clean before soldering is a must. When making a joint of this kind, I like to tin some solder on both parts, position them together, then heat enough to melt the solder and make a good, sound joint.
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Post by Rockoonz on Sept 14, 2014 14:21:40 GMT -5
Yep, just like quartz said. If you have a toaster oven or something to bake all the oil residues out before soldering it will be helpful. 400 plus degrees for 4 hours in what I do for the stuff I do at work.
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